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Wrapper for matrix image filters (#4567)

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Fixes https://github.com/flutter/flutter/issues/14082
This commit is contained in:
Jason Simmons 2018-01-19 10:01:57 -08:00 committed by GitHub
parent 77d7c961cd
commit f458d99e16
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3 changed files with 26 additions and 15 deletions
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27
lib/ui/painting.dart
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@ -1721,26 +1721,25 @@ class ColorFilter {
class ImageFilter extends NativeFieldWrapperClass2 {
void _constructor() native 'ImageFilter_constructor';
/// A source filter containing an image.
// ImageFilter.image({ Image image }) {
// _constructor();
// _initImage(image);
// }
// void _initImage(Image image) native 'ImageFilter_initImage';
/// A source filter containing a picture.
// ImageFilter.picture({ Picture picture }) {
// _constructor();
// _initPicture(picture);
// }
// void _initPicture(Picture picture) native 'ImageFilter_initPicture';
/// Creates an image filter that applies a Gaussian blur.
ImageFilter.blur({ double sigmaX: 0.0, double sigmaY: 0.0 }) {
_constructor();
_initBlur(sigmaX, sigmaY);
}
void _initBlur(double sigmaX, double sigmaY) native 'ImageFilter_initBlur';
/// Creates an image filter that applies a matrix transformation.
///
/// For example, applying a positive scale matrix (see [new Matrix4.diagonal3])
/// when used with [BackdropFilter] would magnify the background image.
ImageFilter.matrix(Float64List matrix4,
{ FilterQuality filterQuality: FilterQuality.low }) {
if (matrix4.length != 16)
throw new ArgumentError('"matrix4" must have 16 entries.');
_constructor();
_initMatrix(matrix4, filterQuality.index);
}
void _initMatrix(Float64List matrix4, int filterQuality) native 'ImageFilter_initMatrix';
}
/// Base class for objects such as [Gradient] and [ImageShader] which

12
lib/ui/painting/image_filter.cc
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@ -4,6 +4,7 @@
#include "flutter/lib/ui/painting/image_filter.h"
#include "flutter/lib/ui/painting/matrix.h"
#include "lib/tonic/converter/dart_converter.h"
#include "lib/tonic/dart_args.h"
#include "lib/tonic/dart_binding_macros.h"
@ -11,6 +12,7 @@
#include "third_party/skia/include/effects/SkBlurImageFilter.h"
#include "third_party/skia/include/effects/SkImageSource.h"
#include "third_party/skia/include/effects/SkPictureImageFilter.h"
#include "third_party/skia/src/core/SkMatrixImageFilter.h"
namespace blink {
@ -23,7 +25,8 @@ IMPLEMENT_WRAPPERTYPEINFO(ui, ImageFilter);
#define FOR_EACH_BINDING(V) \
V(ImageFilter, initImage) \
V(ImageFilter, initPicture) \
V(ImageFilter, initBlur)
V(ImageFilter, initBlur) \
V(ImageFilter, initMatrix)
FOR_EACH_BINDING(DART_NATIVE_CALLBACK)
@ -54,4 +57,11 @@ void ImageFilter::initBlur(double sigma_x, double sigma_y) {
SkBlurImageFilter::kClamp_TileMode);
}
void ImageFilter::initMatrix(const tonic::Float64List& matrix4,
int filterQuality) {
filter_ = SkMatrixImageFilter::Make(
ToSkMatrix(matrix4), static_cast<SkFilterQuality>(filterQuality),
nullptr);
}
} // namespace blink

2
lib/ui/painting/image_filter.h
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@ -8,6 +8,7 @@
#include "flutter/lib/ui/painting/image.h"
#include "flutter/lib/ui/painting/picture.h"
#include "lib/tonic/dart_wrappable.h"
#include "lib/tonic/typed_data/float64_list.h"
#include "third_party/skia/include/core/SkImageFilter.h"
namespace blink {
@ -24,6 +25,7 @@ class ImageFilter : public fxl::RefCountedThreadSafe<ImageFilter>,
void initImage(CanvasImage* image);
void initPicture(Picture*);
void initBlur(double sigma_x, double sigma_y);
void initMatrix(const tonic::Float64List& matrix4, int filter_quality);
const sk_sp<SkImageFilter>& filter() { return filter_; }